78825 has 12 divisors (see below), whose sum is σ = 130448. Its totient is φ = 42000.

The previous prime is 78823. The next prime is 78839. The reversal of 78825 is 52887.

It is not a de Polignac number, because 78825 - 2¹ = 78823 is a prime.

It is a Duffinian number.

78825 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 78792 and 78801.

It is not an unprimeable number, because it can be changed into a prime (78823) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 451 + ... + 600.

2⁷⁸⁸²⁵ is an apocalyptic number.

78825 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78825 is a deficient number, since it is larger than the sum of its proper divisors (51623).

78825 is a wasteful number, since it uses less digits than its factorization.

78825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064 (or 1059 counting only the distinct ones).

The product of its digits is 4480, while the sum is 30.

The square root of 78825 is about 280.7579028273. The cubic root of 78825 is about 42.8766974256.

It can be divided in two parts, 7882 and 5, that added together give a palindrome (7887).

The spelling of 78825 in words is "seventy-eight thousand, eight hundred twenty-five".